Office常用文件 转 PDF 生成输出流返回

aspose jar下载不下来，需要修改下载jar包的来源

<repositories>
        <repository>
            <id>aspose-maven-repository</id>
            <url>https://releases.aspose.com/java/repo</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

1.word(doc和docx)转pdf

        <dependency>
            <groupId>com.aspose</groupId>
            <artifactId>aspose-words</artifactId>
            <version>20.12</version>
            <type>pom</type>
        </dependency>

package com.ruoyi.web.controller.common;

import com.aspose.words.Document;
import com.aspose.words.License;
import com.aspose.words.SaveFormat;
import com.ruoyi.common.exception.ServiceException;
import org.apache.xmlbeans.ResourceLoader;
import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class WordToPdf {
    public static InputStream wordToPdf(MultipartFile file) {try(ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
            Document doc = new Document(file.getInputStream()); //sourceFile是将要被转化的word文档
            doc.save(baos, SaveFormat.PDF);//全面支持DOC, DOCX, OOXML, RTF HTML, OpenDocument, PDF, EPUB, XPS, SWF 相互转换

            byte[] pdfBytes = baos.toByteArray();
            InputStream pdfInputStream = new ByteArrayInputStream(pdfBytes);
            return pdfInputStream;
        } catch (Exception e) {
            System.out.println("convert failed");
            e.printStackTrace();
            throw new ServiceException("convert word to pdf failed");
        }
    }
}

2.Excel（xls和xlsx）转pdf

<dependency>
       <groupId>com.aspose</groupId>
       <artifactId>aspose-cells</artifactId>
       <version>20.12</version>
</dependency>

package com.ruoyi.web.controller.common;

import com.aspose.cells.PdfSaveOptions;
import com.aspose.cells.Workbook;
import com.aspose.words.License;
import com.ruoyi.common.exception.ServiceException;
import org.apache.xmlbeans.ResourceLoader;
import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class ExcelToPdf {
    public static InputStream excelToPdf(MultipartFile file) {try(ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
            Workbook wb = new Workbook(file.getInputStream());
            PdfSaveOptions pdfSaveOptions = new PdfSaveOptions();
            pdfSaveOptions.setOnePagePerSheet(true);
            wb.save(baos, pdfSaveOptions);
            baos.flush();
            baos.close();
            byte[] pdfBytes = baos.toByteArray();
            InputStream pdfInputStream = new ByteArrayInputStream(pdfBytes);
            return pdfInputStream;
        } catch (Exception e) {
            e.printStackTrace();
            throw new ServiceException("convert excel to pdf failed");
        }
    }
}

3.ppt（ppt和pptx）转pdf

 <dependency>
            <groupId>com.aspose</groupId>
            <artifactId>aspose-slides</artifactId>
            <version>20.12</version>
            <classifier>jdk16</classifier>
        </dependency>

package com.ruoyi.web.controller.common;

import com.aspose.slides.Presentation;
import com.aspose.slides.SaveFormat;
import com.ruoyi.common.exception.ServiceException;
import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class PptToPdf {
    public static InputStream pptToPdf(MultipartFile file) {
        try(ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
            Presentation pres = new Presentation(file.getInputStream());
            pres.save(baos, SaveFormat.Pdf);
            byte[] pdfBytes = baos.toByteArray();
            InputStream pdfInputStream = new ByteArrayInputStream(pdfBytes);
            return pdfInputStream;
        }catch (Exception e) {
            e.printStackTrace();
            throw new ServiceException("convert ppt/pptx to pdf failed");
        }
    }
}

注：免费版生成出来是有水印的，如果购买正版，会有license，把文件放到resource目录下，读取并验签

 private static boolean getLicense() {
        boolean result = false;
        try {
            ClassLoader classLoader = ResourceLoader.class.getClassLoader();
            InputStream is = classLoader.getResourceAsStream("license.xml"); // license.xml应放在resource路径下
            License aposeLic = new License();
            aposeLic.setLicense(is);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }